CVE-2025-8351 Avira antivirus engine heap buffer OOB read when scanning a malformed file
A heap buffer overflow in Avira Antivirus allows local attackers to execute code or cause denial of service via malformed files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-8351?
CVE-2025-8351 is a high-severity memory corruption vulnerability in Gen Digital Avira Antivirus, published on 1 Dec 2025. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Heap-based Buffer Overflow, Out-of-bounds Read vulnerability in Avira Antivirus engine when scanning a malformed file may allow Local Execution of Code or Denial-of-Service of the antivirus engine process.
This issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.70.98.
Which versions are affected by CVE-2025-8351?
How do I fix CVE-2025-8351?
No fix has been published for CVE-2025-8351 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-8351 being exploited?
There is no known exploitation of CVE-2025-8351 in the wild and no public exploit code.
Sources
Also known as GHSA-mgc9-26px-4hjp.